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首页> 外文期刊>International journal of chemical engineering >A Study of CO2 Methanation over Ni-Based Catalysts Supported by CNTs with Various Textural Characteristics
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A Study of CO2 Methanation over Ni-Based Catalysts Supported by CNTs with Various Textural Characteristics

机译:多种结构特征的碳纳米管负载镍基催化剂上的甲烷甲烷化研究

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摘要

This work studied the influence of textural characteristics of CNTs on catalytic performance of Ni/CNTs for CO2 methanation. The CNTs supports were prepared by chemical vapor deposition method using Ni/MgO catalysts, and acetonitrile and ethanol were used as carbon sources, respectively. The Ni/CNTs catalysts were prepared via impregnation method and characterized by X-ray diffraction (XRD), N2 adsorption/desorption, and temperature-programmed reduction (H2-TPR) techniques. The results indicated that the textural characteristics of CNTs supports significantly impacted on the catalytic performance of Ni/CNTs. The catalyst Ni/CNTs-E (CNTs using ethanol as carbon source) had good reducibility, high specific surface area, and moderate defects, resulting in higher CO2 conversion and CH4 yield, followed by Ni/CNTs-C (commercial CNTs) and Ni/CNTs-A (CNTs using acetonitrile as carbon source). Based on Arrhenius formula, activation energies of the catalysts were calculated and were found decreased for Ni/CNTs-A and Ni/CNTs-E.
机译:这项工作研究了碳纳米管的结构特征对Ni / CNTs催化CO2甲烷化性能的影响。使用Ni / MgO催化剂通过化学气相沉积法制备CNTs载体,分别使用乙腈和乙醇作为碳源。 Ni / CNTs催化剂通过浸渍法制备,并通过X射线衍射(XRD),N2吸附/解吸和程序升温还原(H2-TPR)技术进行了表征。结果表明,碳纳米管的织构特征显着影响了镍/碳纳米管的催化性能。 Ni / CNTs-E催化剂(使用乙醇作为碳源的CNT)具有良好的还原性,高比表面积和适度的缺陷,从而导致较高的CO2转化率和CH4收率,其次是Ni / CNTs-C(商业CNT)和Ni / CNTs-A(使用乙腈作为碳源的CNT)。根据Arrhenius公式,计算出催化剂的活化能,发现Ni / CNTs-A和Ni / CNTs-E的活性降低。

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